Parametric equation of the ellipse Assignment Help

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Parametric equation of the ellipse:

Thus for any point P(x, y) on ellipse we have x = a cosθ, y = b sinθ are called as parametric equation of ellipse.

Position of a Point Relative to Ellipse:

The point P(x1, y1) is outside or inside or on ellipse 346_Ellipse2.png according as the quantity 1914_Parametric equation of the ellipse.png  may be positive or negative or zero.

Illustration: Consider ellipse x2 + 3y2 = 6 and a point P on it in the 1st quadrant at a distance of 2 units from centre. Find eccentric angle of P.                                                                       

Solution:           The equation of ellipse is x2 + 3y2 = 6

                        The equation of auxiliary circle is x2 + y2 = 6

                              As P ≡ (x1, y1) & Q ≡ (x1, y2) lie on ellipse and circle respectively we have,

               x12 + 3y12 = 6                               .....(1)

               x12 + y22 = 6                                 .....(2)

                              ∴3y12 -y22 = 0  => 145_Parametric equation of the ellipse2.png       

                              Again OP = 2 => x12 + y12 = 4      .....(3)

                              By (1) -(3), we get,

       2099_Parametric equation of the ellipse1.png

                              2y12 = 2  => y12 = 1 =>  y1 = 1   [∴ P is in the 1st quadrant]                                             

                              ∴y2 = √3

                              Putting y1 in (1), we get   x12 = 3  => x1 =√3 

                        ∴ The eccentric angle of 1982_Parametric equation of the ellipse3.png

 

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